/*
 * 	<pre>
 *	EasyPeas.
 *  Copyright (C) 2007 S Owen
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Jul 24, 2007
 * TemplateFinderImpl.java
 * </pre>
 */
package org.easypeas.templates;

import java.util.Map;
import java.util.logging.Logger;

import org.easypeas.EasyPeasConstants;
import org.easypeas.exceptions.UnableToDetermineTemplateException;
import org.easypeas.mappings.Mappings;

/**
 * An implementation of TemplateFinder that uses the values in the map defined
 * by the key {@link EasyPeasConstants#EASYPEA_TEMPLATE} or
 * {@link EasyPeasConstants#EASYPEA_FORWARD} to determine the template.</br>
 * 
 * @author S Owen
 * 
 */
public class TemplateFinderImpl implements TemplateFinder {

	private static Logger logger = Logger.getLogger("org.easypeas.templates.TemplateFinderImpl");

	/**
	 * {@inheritDoc}
	 */
	public String find(Map<String, Object> peaMap, Mappings mappings)
			throws UnableToDetermineTemplateException {
		String result;
		if (peaMap.get(EasyPeasConstants.EASYPEA_TEMPLATE) != null) {
			result = (String) peaMap.get(EasyPeasConstants.EASYPEA_TEMPLATE);
                }
		else if (peaMap.get(EasyPeasConstants.EASYPEA_FORWARD) != null) {
			result = (String) peaMap.get(EasyPeasConstants.EASYPEA_FORWARD);
		} else if (peaMap.get(EasyPeasConstants.EASYPEA_PEA) == null) {
			throw new UnableToDetermineTemplateException(
					"No easypea stored in response map");
                }
		else if (peaMap.get(EasyPeasConstants.EASYPEA_METHOD) == null) {
			throw new UnableToDetermineTemplateException(
					"No easypea method stored in response map");
                }
		else {
			String key = mappings.getName(peaMap
					.get(EasyPeasConstants.EASYPEA_PEA));
			if (key == null) {
				throw new UnableToDetermineTemplateException(
						"Unable to find key for object:"
								+ peaMap.get(EasyPeasConstants.EASYPEA_PEA));
                        }
			result = "/" + key + "/"
					+ peaMap.get(EasyPeasConstants.EASYPEA_METHOD) + ".vm";
		}
		return result;
	}
}
